I strung this up as an experiment (never used it before) for a hard hitting High School player @ 59 in a Wilson K Bold. He needed more control and durability than he was getting with other synguts and I was unwilling to suggest poly. He practices 3 times a week in addition to his matches. It lasted 9 weeks before he finally popped a cross right in the middle of the sweetspot! What's that, 30-40 hours? He and his parents were pleased. I was impressed. Although they probably should've come back sooner. BTW it strings up strangely for a syngut. Stiff like a poly, yet with a zingy sound like kevlar because of the texture. Yet it 'pings' nicely and has very little vibration. Not a true playtest, but I thought y'all might like to know.